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Question about string-match and match-string
From: |
Suvayu Ali |
Subject: |
Question about string-match and match-string |
Date: |
Wed, 17 Jul 2013 10:17:04 +0200 |
User-agent: |
Mutt/1.5.21 (2012-12-30) |
Hi,
I was writing a filter for Org mode and came across this confusion. I
want to parse a string with LaTeX code and delete matching
sub-expressions. As a test I tried this:
(let ((test "\\section{Heading{ignoreheading}}\nText\n"))
(string-match "\\(\\\\\\\\section{.+{ignoreheading}}\\\\n\\)\\(.+\\)" test)
(match-substitute-replacement "" t nil test 1)
)
But evaluating the above I get the following backtrace.
Debugger entered--Lisp error: (args-out-of-range -1 -1)
replace-match("" t nil "{" 1)
match-substitute-replacement("" t nil
"\\section{Heading{ignoreheading}}\nText\n" 1)
(let ((test "\\section{Heading{ignoreheading}}\nText\n")) (string-match
"\\(\\\\\\\\section{.+{ignoreheading}}\\\\n\\)\\(.+\\)" test)
(match-substitute-replacement "" t nil test 1))
eval((let ((test "\\section{Heading{ignoreheading}}\nText\n")) (string-match
"\\(\\\\\\\\section{.+{ignoreheading}}\\\\n\\)\\(.+\\)" test)
(match-substitute-replacement "" t nil test 1)) nil)
eval-last-sexp-1(nil)
eval-last-sexp(nil)
call-interactively(eval-last-sexp nil nil)
command-execute(eval-last-sexp)
I do not understand the error at all, since if I insert something like
(prin1 test) before the (match-substitute-replacement ..) in my example
code, I get the expected output (the value of test as bound by let).
Where am I going wrong?
Thank you for any guidance.
PS: I'm also not very clear why we need 4 \-s in the regex to match a
single \ in the string. I came up with it by trial and error with the
regexp-builder. Any explanation about that would also be great.
--
Suvayu
Open source is the future. It sets us free.
- Question about string-match and match-string,
Suvayu Ali <=
- Re: Question about string-match and match-string, Suvayu Ali, 2013/07/17
- Re: Question about string-match and match-string, Rasmus, 2013/07/17
- Re: Question about string-match and match-string, Suvayu Ali, 2013/07/17
- Re: Question about string-match and match-string, Julien Cubizolles, 2013/07/18
- Re: Question about string-match and match-string, Rasmus, 2013/07/18
- Re: Question about string-match and match-string, Julien Cubizolles, 2013/07/20
- Re: Question about string-match and match-string, Rasmus, 2013/07/20
- Re: Question about string-match and match-string, Rasmus, 2013/07/20
- Re: Question about string-match and match-string, Julien Cubizolles, 2013/07/21
Re: Question about string-match and match-string, Nicolas Richard, 2013/07/17